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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.dispatcher;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.entrypoint.ClusterEntrypoint;
import org.apache.flink.runtime.jobgraph.JobGraph;
import org.apache.flink.runtime.rpc.RpcService;

import org.apache.flink.shaded.guava18.com.google.common.collect.Iterables;

import java.util.Collection;

import static org.apache.flink.runtime.entrypoint.ClusterEntrypoint.EXECUTION_MODE;

/**
 * {@link DispatcherFactory} which creates a {@link MiniDispatcher}.
 */
public enum JobDispatcherFactory implements DispatcherFactory {
	INSTANCE;

	@Override
	public MiniDispatcher createDispatcher(
			RpcService rpcService,
			DispatcherId fencingToken,
			Collection recoveredJobs,
			PartialDispatcherServicesWithJobGraphStore partialDispatcherServicesWithJobGraphStore) throws Exception {
		final JobGraph jobGraph = Iterables.getOnlyElement(recoveredJobs);

		final Configuration configuration = partialDispatcherServicesWithJobGraphStore.getConfiguration();
		final String executionModeValue = configuration.getString(EXECUTION_MODE);
		final ClusterEntrypoint.ExecutionMode executionMode = ClusterEntrypoint.ExecutionMode.valueOf(executionModeValue);

		return new MiniDispatcher(
			rpcService,
			getEndpointId(),
			fencingToken,
			DispatcherServices.from(partialDispatcherServicesWithJobGraphStore, DefaultJobManagerRunnerFactory.INSTANCE),
			jobGraph,
			executionMode);
	}
}